IMPHAL, April 17: Decrying the bomb attack at the residence of Superintending Engineer (SE) IFCD, Soibam Dhanabir Singh son of Dhananjoy last evening, a sit in protest demonstration was held today at the Thangmeiband Sinam Leikai locality. The protest was jointly organized by the Thangmeiband Sinam Leikai Women folk and local youth club in front of the residence of the SE.Locals said a bomb exploded around 6:15 pm inside the premises of the SE last evening however there were no casualty. Talking to media persons Dhanabir disclosed that there has been no personal threat or monetary demands of any sort. He however recalled that there were instances of refusal of contract works to some individuals.It is yet to be ascertained who was behind the attack and the motive for the attack, he added.